Comparison of age-specific hospitalization during pandemic and seasonal influenza periods from 2009 to 2012 in Taiwan: a nationwide population-based study

Table 1 The ICU admission rate and CFR categorized by age in the five epidemics from July 2009 to October 2012

	≤6		7-12		13-18		19-49		50-64		≥65
Epidemics	ICU %	CFR	ICU %	CFR	ICU %	CFR	ICU %	CFR	ICU %	CFR	ICU %	CFR
p1	1.49	0.04	0.8	0.03	1.21	0.00	2.73	0.43	9.88	1.23	10.34	4.50
p2	1.7	0.10	1.85	0.16	1.69	0.15	4.87	0.56	13.77	3.73	13.17	5.90
s1	1.26	0.03	0.5	0.00	0.84	0.00	1.53	0.22	4.76	1.04	6.57	2.55
s2	0.74	0.06	0.4	0.09	1.4	0.17	1.84	0.17	4.33	1.25	9.78	3.13
s3	1.3	0.06	0.64	0.18	0	0.00	2.19	0.29	3.18	0.31	8.85	2.63

ICU: intensive care unit
CFR: case fatality ratio
Periods p1 and p2 were pandemic periods
Periods s1, s2 and s3 were seasonal periods
The ICU admission rate was calculated by taking the number of ICU cases divided by the number of hospitalized cases
The CFR was calculated by taking the number of fatal cases divided by the number of hospitalized cases

ISSN: 1471-2334